| Sydney - Wikipedia, the free encyclopedia (4909 words) |
 | In April 1789 a disease, thought to be smallpox, decimated the indigenous population of Sydney; a conservative estimate says that 500 to 1000 Aboriginal people died in the area between Broken and Botany Bays. |
| Sydney is in a coastal basin bordered by the Pacific Ocean to the east, the Blue Mountains to the west, the Hawkesbury River to the north and the Woronora Plateau to the south. |
| Sydney lies on a submergent coastline, where the ocean level has risen to flood deep river valleys (rias) carved in the sandstone. |
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